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How to refer an external parameter in a calculated field



In the search form of a tabular report, I pass as a external parameter called [@prod] on exit. I want to know how to use the parameter con the formula (SELECT Sum(Entrada) FROM Cuadre_Indigo WHERE Producto=[@prod] ) - 
(SELECT Sum(Salida) FROM Cuadre_Indigo WHERE Producto=[@prod] )

Also ignore the criteria if its null.

The formula doesn't seem to work

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